OMAP 4 - Android : device as a BT headset

I am using OMAP4 based board, running ICS on it. 

I want my device to behave as BT headset.

I tried changing the audio.conf to support A2DP sink. I am able to discover & connect to my device from my Linux PC using Bluez API, still once it is connected it recognizes it as a AVRCP input device. 

What I understood by going through the source code of Bluez HAL is, there is no implementation for input_stream.

Then, I read about different BT stack (bluedroid) is being used in Android Jelly Bean (4.2) & so downloaded the JB 4AJ2.2 release notes & checked it, in that also it still uses the Bluez stack. I didn't find anything relevant to Bluedroid. Why?

Now, how do I go about achieving my goal of making my android device as a BT headset? 

Any inputs?

Thanks & Regards,
Ramya.M